Graduale (fragm.) – ms. New York, Butler Libr. [cote non spécifiée]
15th cent., Germany Vellum; single leaf, 384 x 280 mm. Four-line staves of red with hufnagelschrift neumes; two-line blue, red or calligraphic black initials
Auction: Christie’s, London (King Street), 2 June 2004, lot 1 (piece 7)
